Pipe-grab.



W. s. SEAMA 4PIPE GRAB APPLICATION FILED SBP A PATENTED MAR. 10, 1908.

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/I L" y GRM/umg wALTEE sco'r'r sEAMAN, 0E BEAVER, NORTE DAKOTA.

PIPE-GRAB.l

Specication of Letters Patent.

Patented March 10, 1908.

Application. led. September 11, 1907.` Serial No. 392,311.

` To all whom 'it may concern.'

Be it known that I WALTER Soo'r'r SEA- MAN, a citizen of the nitedStates, residino` at Beaver, in the count ofv Bowman an State of NorthDakota, have invented certain new and useful Im rovements 'in Pipe-Grabs, of which the follldwing is a speciiication.

. My invention ertains to improvements in pipe grabs, use `in thedrilling of wells to recover lost or displaced i e sections, and has forits object to simpll' the construction, increase the efficiency and tolessen the cost of production of devices of this type, and

to rovide a thoroughly ractical pi e grab. ith the above and'otherobjectslin view,

' my invention further consists in the. novel bases 6. To provide forthis movement as.

details of construction and combination of parts to be fully described4in. the following specification-and lpointed out in the claims.

Referring'to t e accompanying drawings forming a part of thisspecification, and wherein like characters of reference denote similarparts throughout the several views Figure 1 isa central verticalsectional view, and' Fig. 2, is a transverse section taken Aon line2-2.of Fig. 1. j

The 'invention contem lates a casing 1, preferably cylindrical in orm,which has a closed lower end and a cap 2, of any desired type, removablyfitted to 1ts upper end. At

a point adjacent the bottom of the casing a stationary plate 3, issecured by means of screws or the like.

4, Vdesi ates operating rod,4 ther-.upper end of" "ch is passed throu'han openm provided therefor in ca 2, an the lower en of which is. threadeand received in a threaded opening formed therefor in plateS. A handwheel 5, is secured to the upper end of rod 4.

Secured to the upper face of plate 3, are the feet 6, of the jaw members7, the latter embodying vertically arranged -shanks which terminate inoutwardly turned ends 8, having serrated faces 9, which are'adapted toengage the inner face of the pipe 10, as depicted in the drawings. Toaccommodate the ends 8, of the jaw members, is formed with slots 11,through which ends 8, project. The jaw members 7, are formed I ofspring-like material so that the serrated faces of the same may moveoutwardly and inwardly with respect to casing 1, and their well as tocause' the serrated faces to iirmly bers.

. outwardly cated to rod 4, the latter will the casing 1,

grip the pipe during the removal of the latter, I employ anabutment 12,which is formed to occupy the interior of casing 1, and to have acentral longitudinal opening through which operating rods 4, free ypasses. Collars 13 and 14, are firmly sustained on rod'4, and engagesthe opposite ends of abutment 12, to thereby prevent longitudinalmovement of the abutment with res ect to rod 4. The abutment'is formedwit twofopposite vertical slots 15, which receive the jaw memberstherein, these slots being of such width as to freely receive the upperends .of the jaw mem- The bottoms of the slots are formed with cam faces16, which bear against the rear of the outturned ends V8, of the jawmembers 7, and thus when the abutment is lowered with respect to the jawmembers, the ends 8, of the latter will be gradually forced with thepipe 10.

To assist the jaws in their function of gri ing the ipe during theremoval of the latter, l) provi e a compressible and expansible washer17, of a size which when forced into pipe 10, will expand and grip 4thepipe to thereby further assist the action of jaws 10. This washer bearsagainst the bottom of casing 1, and is removably secured thereto bymeans of a metal washer 18, and screw 19,

.which latter is in threaded engagement with the casingbottom.l

The operation will be understood from the above; rotary movement be'communi- ,Y e raised or lowereddue t'its threaded connection withstationary plate 3, carrying abutment 12 therewith. Since abutment 12,freely receives rod 4, the latter will not communicate its rotary motionthereto. By adjusting the position ot the abutment with respect to thejaw members the latter may be caused to grip the pipe being removed asmay be found necessary or desirable. Washerv 17, serves to also properlycenter the lower end of casing 1, and assists in enabling the device toobtain further gripping action on the pi e in addition to that securedby the jaw mem ers.

What I claim is 1. A pipe grab embodying a casing, jaw members carriedby said casing and projecting be ond the sides thereof, and anadjustable a utment in said casing bearing against said jaw members.

2. A pipe grab embodying a casing, a plate stationary therein and havinga threaded into rm gripping engagementV opening, jaw members supportedat their lower ends from said plate and having their upper ends serratedand projecting beyond the casing sides, an operating rod having athreaded part engaging said threaded opening of the plate, and anabutment loosely mounted on said rod means to cause said abutment topartake of the longitudinal movement of said rod, said abutment havingcam faces which bear against said'jaw members and force the same beyondsaid casing Sides-'A b b d s 3. egrav emo `i n acasin ,aexible wasiidion the bottoin nd of tle casing projecting beyond the casing sides,means to clamp said washer to said casing end, and means at the oppositeend of the casing to engage the pipe.

4. A pipe grab embodying a casing', an expansibl'e washer secured to theexterior of the l ottom of said casing, jaw members secured at their`lower ends on the casing interior and at their upper ends projectingbeyond the exterior o the casing, and means or impelling said upper endsof the jaw members outwardl pipe grab embodying a casing, an ex-Ypans'ible washer secured to the lower end of the casing and projectingbeyond the sides thereof, aw memberscarried b said casing and havinggripping faces whic project beyond ythe casing sidesat the upper ortionof the casing, and means to move sai gripping faces outwardly beyond thecasing sides.

6. lA ipe grab embodying a casing, a iiexible was er immovably carriedon the bottom thereof to engage the pipe, means carried by the casingadj acentl the upper portion ythereof toalso engage the pipe, and meansto actuate' sald last-named means.

7. A pipe grab embodying a casing, a plate rigidly secured therein andhaving a threaded opening, jaw members having gripping faces projectingbeyond the casing sides, a rod threaded at one end into said opening ofthe plate, and means on the rod to engage said jaw members and move thegripping faces thereof outwardly.

8. A ipe grab embodying acasing, a plate therein aving a threadedopening, vertically dis osed jaw members secured at their lower ends 'tosaid late and having right angular upper ends w ich project beyond thecasing sides and terminate in grip ing faces, an operating rod having athreaded part engaging said threaded opening of said plate an abutmentfreely carried by said rod and having vertical slots therein in whichthe u per ends of said jaw members extend, cam aces carried by saidabutment to engage the rear portions of said right angular ends of thejaw members, and means on `the rod to engage said abutment and preventlongitudinal movement thereof on said rod.

9. A pipe grab embodying jaw members, and an operating rod thereforcarrying means to engage said jaw members and im el the same outwardly,said means being oosely mounted on said rod, means whereby said meanswill move with said rod and means whereby when said rod is rotated thesame will be advanced so as to advance said means for actuating the jawmembers.

In testimony whereof I affix my signature,

p in presence of two witnesses.

WALTER SCOTT SEAMAN.

Witnesses:

J. A. WETHERILL', A. LAKE.

